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| DS1558 Datasheet, PDF (12/18 Pages) Dallas Semiconductor – Watchdog Clock with NV RAM Control | |||
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DS1558
DC ELECTRICAL CHARACTERISTICS
(VCC = +3.3V ±10% or +5V ±10%, TA = -40°C to +85°C.)
PARAMETER
SYMBOL MIN
Active Supply Current, +5V
ICC
Active Supply Current, +3.3V
ICC
TTL Standby, +5V ( CE = VIH)
ICC1
TTL Standby, +3.3V ( CE = VIH)
CMOS Standby Current, +5V
( CE ³ VCC - 0.2V)
CMOS Standby Current, +3.3V
( CE ³ VCC - 0.2V)
Input Leakage Current
(Any Input)
Output Leakage Current
(Any Output)
Output Logic 1 Voltage
(IOUT = -1.0mA)
ICC1
ICC2
ICC2
IIL
-1
IOL
-1
VOH
2.4
Output Logic 0
Voltage
IOUT = 2.1mA,
DQ0âDQ7 Outputs
IOUT = 7.0mA,
IRQ /FT and RST
Outputs
VOL1
VOL2
Write Protection Voltage, +5V
VPF
4.20
Write Protection Voltage, +3.3V
VPF
2.75
Battery Switchover Voltage, +5V
VSO
Battery Switchover Voltage, +3.3V
VSO
Battery Current OSC On
IOSC
Battery Current OSC Off
Output Voltage ICCO = 70mA, +5V
Output Voltage ICCO = 40mA, +3.3V
Output Voltage ICCO = 10µA
IBACKUP
VCC01
VCC01
VCC02
VCC1 -
0.3
VCC1 -
0.3
VBAT -
0.2
TYP
6
4
3
2
2
1
4.37
2.88
VBAT
VPF
0.3
VBAT -
0.031
MAX
25
15
6
6
6
2
+1
+1
0.4
0.4
4.50
2.97
0.5
100
UNITS NOTES
mA
2, 3
mA
2, 3
mA
2, 3
mA
2, 3
mA
2, 3
mA
2, 3
mA
mA
V
1
V
1
V
1, 5
V
1
V
1
V
1
V
1, 4
µA
6,7
nA
7
V
V
V
10
CRYSTAL SPECIFICATIONS*
PARAMETER
SYMBOL MIN TYP MAX UNITS NOTES
Nominal Frequency
Series Resistance
Load Capacitance
fO
32.768
kHz
ESR
45
kâ¦
CL
6
pF
*The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations
for Dallas Real-Time Clocks for additional specifications.
12 of 18
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